Re: DVB-T2 Stick

Mauro Carvalho Chehab
2019-10-01T23:52:12Z

Em Wed, 2 Oct 2019 00:19:05 +0200
Gonsolo <gonsolo@gmail.com> escreveu:

> Hi!
>
> > Secondly there are lots of coding style issues, see:
> > https://www.kernel.org/doc/html/v4.10/process/coding-style.html
>
> I addressed most of these except one "#if 0" warning from checkpatch.
>
> > I'm afraid there are many problems with this patch. First of all it looks
> > like support was added for a si2168 tuner but it looks like it will break
> > for any other si2157-type device.
>
>
> Can you give me a hint how to proceed here? I don't know much about
> DVB tuners or kernel development.
>
> I attached the cleaned-up patch for 5.4.0-rc1

First of all, don't attach a patch. Instead, just send it with a decent
emailer (with won't mangle whitespaces) or use git send-email...

Also, please read the Developer's section of our wiki page:

https://linuxtv.org/wiki/index.php/Developer_section

In special, the "Submitting your work" part of it.

>
> Thanks,
> g
> From 6cada6442207a67202e73721692aced665b8fdf0 Mon Sep 17 00:00:00 2001
> From: Gon Solo <gonsolo@gmail.com>
> Date: Tue, 1 Oct 2019 21:59:44 +0200
> Subject: [PATCH] DVB-T2 with coding style updates.
>
> ---
> drivers/media/tuners/si2157.c | 44 ++++++++++++++++++++++---
> drivers/media/tuners/si2157_priv.h | 8 +++++
> drivers/media/usb/dvb-usb-v2/af9035.c | 47 ++++++++++++++++++++++++++-
> 3 files changed, 93 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/media/tuners/si2157.c b/drivers/media/tuners/si2157.c
> index e87040d6eca7..af50e721281b 100644
> --- a/drivers/media/tuners/si2157.c
> +++ b/drivers/media/tuners/si2157.c
> @@ -75,7 +75,7 @@ static int si2157_init(struct dvb_frontend *fe)
> struct si2157_cmd cmd;
> const struct firmware *fw;
> const char *fw_name;
> - unsigned int uitmp, chip_id;
> + unsigned int uitmp;
>
> dev_dbg(&client->dev, "\n");
>
> @@ -117,7 +117,7 @@ static int si2157_init(struct dvb_frontend *fe)
> if (ret)
> goto err;
> }
> -
> +#if 0
> /* query chip revision */
> memcpy(cmd.args, "\x02", 1);
> cmd.wlen = 1;
> @@ -138,6 +138,8 @@ static int si2157_init(struct dvb_frontend *fe)
> #define SI2141_A10 ('A' << 24 | 41 << 16 | '1' << 8 | '0' << 0)
>
> switch (chip_id) {
> +#endif
> + switch (dev->chip_id) {

You shouldn't just blindly comment out some code, as this will very likely
break support for all other devices supported by the driver...

> case SI2158_A20:
> case SI2148_A20:
> fw_name = SI2158_A20_FIRMWARE;
> @@ -161,9 +163,9 @@ static int si2157_init(struct dvb_frontend *fe)
> goto err;
> }
>
> - dev_info(&client->dev, "found a 'Silicon Labs Si21%d-%c%c%c'\n",
> - cmd.args[2], cmd.args[1], cmd.args[3], cmd.args[4]);
> -
> +// dev_info(&client->dev, "found a 'Silicon Labs Si21%d-%c%c%c'\n",
> +// cmd.args[2], cmd.args[1], cmd.args[3], cmd.args[4]);
> +//
> if (fw_name == NULL)
> goto skip_fw_download;
>
> @@ -456,6 +458,38 @@ static int si2157_probe(struct i2c_client *client,
> memcpy(&fe->ops.tuner_ops, &si2157_ops, sizeof(struct dvb_tuner_ops));
> fe->tuner_priv = client;
>
> + /* power up */
> + if (dev->chiptype == SI2157_CHIPTYPE_SI2146) {
> + memcpy(cmd.args, "\xc0\x05\x01\x00\x00\x0b\x00\x00\x01", 9);
> + cmd.wlen = 9;
> + } else {
> + memcpy(cmd.args,
> + "\xc0\x00\x0c\x00\x00\x01\x01\x01\x01\x01\x01\x02\x00\x00\x01",
> + 15);
> + cmd.wlen = 15;
> + }
> + cmd.rlen = 1;
> + ret = si2157_cmd_execute(client, &cmd);
> + if (ret)
> + goto err;
> + /* query chip revision */
> + /* hack: do it here because after the si2168 gets 0101, commands will
> + * still be executed here but no result
> + */
> + memcpy(cmd.args, "\x02", 1);
> + cmd.wlen = 1;
> + cmd.rlen = 13;
> + ret = si2157_cmd_execute(client, &cmd);
> + if (ret)
> + goto err_kfree;
> + dev->chip_id = cmd.args[1] << 24 |
> + cmd.args[2] << 16 |
> + cmd.args[3] << 8 |
> + cmd.args[4] << 0;
> + dev_info(&client->dev, "found a 'Silicon Labs Si21%d-%c%c%c'\n",
> + cmd.args[2], cmd.args[1], cmd.args[3], cmd.args[4]);
> +
> +

... yet, looking on what you've done, it seems that you're actually
adding support for a different tuner at the si2157 driver.

If this is the case, this should be on a separate patch, and in a way
that it will become clear that it won't break support for any existing
device.

Also, please remove the dead code, instead of commenting it out.

> #ifdef CONFIG_MEDIA_CONTROLLER
> if (cfg->mdev) {
> dev->mdev = cfg->mdev;
> diff --git a/drivers/media/tuners/si2157_priv.h b/drivers/media/tuners/si2157_priv.h
> index 2bda903358da..0f4090e184e9 100644
> --- a/drivers/media/tuners/si2157_priv.h
> +++ b/drivers/media/tuners/si2157_priv.h
> @@ -28,6 +28,7 @@ struct si2157_dev {
> u8 chiptype;
> u8 if_port;
> u32 if_frequency;
> + u32 chip_id;
> struct delayed_work stat_work;
>
> #if defined(CONFIG_MEDIA_CONTROLLER)
> @@ -43,6 +44,13 @@ struct si2157_dev {
> #define SI2157_CHIPTYPE_SI2141 2
> #define SI2157_CHIPTYPE_SI2177 3
>
> +#define SI2158_A20 ('A' << 24 | 58 << 16 | '2' << 8 | '0' << 0)
> +#define SI2148_A20 ('A' << 24 | 48 << 16 | '2' << 8 | '0' << 0)
> +#define SI2157_A30 ('A' << 24 | 57 << 16 | '3' << 8 | '0' << 0)
> +#define SI2147_A30 ('A' << 24 | 47 << 16 | '3' << 8 | '0' << 0)
> +#define SI2146_A10 ('A' << 24 | 46 << 16 | '1' << 8 | '0' << 0)
> +#define SI2141_A10 ('A' << 24 | 41 << 16 | '1' << 8 | '0' << 0)
> +
> /* firmware command struct */
> #define SI2157_ARGLEN 30
> struct si2157_cmd {
> diff --git a/drivers/media/usb/dvb-usb-v2/af9035.c b/drivers/media/usb/dvb-usb-v2/af9035.c
> index 3afd18733614..5b7a00cdcbd8 100644
> --- a/drivers/media/usb/dvb-usb-v2/af9035.c
> +++ b/drivers/media/usb/dvb-usb-v2/af9035.c
> @@ -1206,7 +1206,50 @@ static int it930x_frontend_attach(struct dvb_usb_adapter *adap)
> struct si2168_config si2168_config;
> struct i2c_adapter *adapter;
>
> - dev_dbg(&intf->dev, "adap->id=%d\n", adap->id);
> + //dev_dbg(&intf->dev, "adap->id=%d\n", adap->id);
> + dev_dbg(&intf->dev, "%s adap->id=%d\n", __func__, adap->id);

Why did you do such change? dev_dbg can already print the function, and
much more. See:

https://lwn.net/Articles/434833/

> +
> + /* I2C master bus 2 clock speed 300k */
> + ret = af9035_wr_reg(d, 0x00f6a7, 0x07);
> + if (ret < 0)
> + goto err;
> +
> + /* I2C master bus 1,3 clock speed 300k */
> + ret = af9035_wr_reg(d, 0x00f103, 0x07);
> + if (ret < 0)
> + goto err;
> +
> + /* set gpio11 low */
> + ret = af9035_wr_reg_mask(d, 0xd8d4, 0x01, 0x01);
> + if (ret < 0)
> + goto err;
> +
> + ret = af9035_wr_reg_mask(d, 0xd8d5, 0x01, 0x01);
> + if (ret < 0)
> + goto err;
> +
> + ret = af9035_wr_reg_mask(d, 0xd8d3, 0x01, 0x01);
> + if (ret < 0)
> + goto err;
> +
> + /* Tuner enable using gpiot2_en, gpiot2_on and gpiot2_o (reset) */
> + ret = af9035_wr_reg_mask(d, 0xd8b8, 0x01, 0x01);
> + if (ret < 0)
> + goto err;
> +
> + ret = af9035_wr_reg_mask(d, 0xd8b9, 0x01, 0x01);
> + if (ret < 0)
> + goto err;
> +
> + ret = af9035_wr_reg_mask(d, 0xd8b7, 0x00, 0x01);
> + if (ret < 0)
> + goto err;
> +
> + msleep(200);
> +
> + ret = af9035_wr_reg_mask(d, 0xd8b7, 0x01, 0x01);
> + if (ret < 0)
> + goto err;

The above seems specific for your device. You need to check if the device
is USB_VID_DEXATEK, running the code only on such case.

>
> /* I2C master bus 2 clock speed 300k */
> ret = af9035_wr_reg(d, 0x00f6a7, 0x07);
> @@ -2118,6 +2161,8 @@ static const struct usb_device_id af9035_id_table[] = {
>
> /* IT930x devices */
> { DVB_USB_DEVICE(USB_VID_ITETECH, USB_PID_ITETECH_IT9303,
> + { DVB_USB_DEVICE(USB_VID_DEXATEK, 0x0100,
> + &it930x_props, "Logilink VG0022A", NULL) },
> &it930x_props, "ITE 9303 Generic", NULL) },
> { DVB_USB_DEVICE(USB_VID_AVERMEDIA, USB_PID_AVERMEDIA_TD310,
> &it930x_props, "AVerMedia TD310 DVB-T2", NULL) },

Thanks,
Mauro